×

Optical positioning device using telecentric imaging

  • US 7,773,070 B2
  • Filed: 05/09/2005
  • Issued: 08/10/2010
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
Patent Images

1. An optical displacement sensor for sensing movement of a data input device across a surface by determining displacement of optical features in a succession of frames, the sensor comprising:

  • an illuminator comprising a coherent light source configured to illuminate a portion of the surface, with illumination having a substantially planar phase front before impinging upon the surface;

    object-side telecentric imaging optics configured to image the optical features comprising a speckle pattern emanating from the illuminated portion of the surface;

    an array of photosensitive elements configured to detect intensity data relating to the optical features imaged by the object-side telecentric imaging optics; and

    wherein the speckle pattern imaged by the object-side telecentric imaging optics is imaged with reduced speckle boiling during translation of the surface with respect to the data input device.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×